A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
First, update macOS. Version 15.7.7 is the current release. Also, confirm that Office is fully updated. the current build is 16.110.2 [or higher depending on which Update Channel you use].
If the issue persists please provide as much additional info as possible, including;
- Whether this happens with only one file. If so is it random or at the same location each time?
- Are multiple monitors being used?
- What is the nature of the problem file(s)?
- Anything else you can offer to further clarify the issue.